Not would be, has been. Two children died in a tent a few years ago because a still lit barbecue had been left in the tent overnight. Yes, an awning is probably better ventilated than a tent but why take the risk?I disagree with the use of electric heaters in awning but would also remind everyone that any solid or gas fueled heaters will produce Carbon Monoxide (CO) which in a confined area, sealed from draughts, would be deadly.